lkml.org 
[lkml]   [2019]   [Apr]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/2] mmc: sdhci-milbeaut: add Milbeaut SD controller driver
Date
SD Host controller on Milbeaut is consist of two controller parts.
One is core controller F_SDH30, this is similar to sdhci-fujitsu
controller.
Another is bridge controller.
This bridge controller is not compatible with sdhci-fujitsu controller.
This is special for Milbeaut series. This has some functions.
For example, reset control, clock enable/select for SDR50/25/12, set
property of SD physical pins, retuning control, set capabilityies.

This bridge controller requires special procedures at reset or clock
enablement or change for further tuning of clock.

This new driver uses GPIO descriptor from platform data to switch
the power.

Signed-off-by: Takao Orito <orito.takao@socionext.com>
---
drivers/mmc/host/Kconfig | 11 ++
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/sdhci-milbeaut.c | 393 ++++++++++++++++++++++++++++++++++++++
drivers/mmc/host/sdhci_f_sdh30.c | 26 +--
drivers/mmc/host/sdhci_f_sdh30.h | 32 ++++
5 files changed, 438 insertions(+), 25 deletions(-)
create mode 100644 drivers/mmc/host/sdhci-milbeaut.c
create mode 100644 drivers/mmc/host/sdhci_f_sdh30.h

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 28fcd8f..9b39111 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -353,6 +353,17 @@ config MMC_SDHCI_F_SDH30

If unsure, say N.

+config MMC_SDHCI_MILBEAUT
+ tristate "SDHCI support for Socionext Milbeaut Serieas using F_SDH30"
+ depends on MMC_SDHCI_PLTFM
+ depends on OF
+ help
+ This selects the Secure Digital Host Controller Interface (SDHCI)
+ Needed by Milbeaut SoC for MMC / SD / SDIO support.
+ If you have a controller with this interface, say Y or M here.
+
+ If unsure, say N.
+
config MMC_SDHCI_IPROC
tristate "SDHCI support for the BCM2835 & iProc SD/MMC Controller"
depends on ARCH_BCM2835 || ARCH_BCM_IPROC || COMPILE_TEST
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 7357871..db98e8a 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_MMC_SDHCI_PXAV2) += sdhci-pxav2.o
obj-$(CONFIG_MMC_SDHCI_S3C) += sdhci-s3c.o
obj-$(CONFIG_MMC_SDHCI_SIRF) += sdhci-sirf.o
obj-$(CONFIG_MMC_SDHCI_F_SDH30) += sdhci_f_sdh30.o
+obj-$(CONFIG_MMC_SDHCI_MILBEAUT) += sdhci-milbeaut.o
obj-$(CONFIG_MMC_SDHCI_SPEAR) += sdhci-spear.o
obj-$(CONFIG_MMC_SDHCI_AM654) += sdhci_am654.o
obj-$(CONFIG_MMC_WBSD) += wbsd.o
diff --git a/drivers/mmc/host/sdhci-milbeaut.c b/drivers/mmc/host/sdhci-milbeaut.c
new file mode 100644
index 0000000..0bdb168
--- /dev/null
+++ b/drivers/mmc/host/sdhci-milbeaut.c
@@ -0,0 +1,393 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2013 - 2015 Fujitsu Semiconductor, Ltd
+ * Vincent Yang <vincent.yang@tw.fujitsu.com>
+ * Copyright (C) 2015 Linaro Ltd Andy Green <andy.green@linaro.org>
+ * Copyright (C) 2019 Socionext Inc.
+ * Takao Orito <orito.takao@socionext.com>
+ */
+
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/property.h>
+
+#include "sdhci-pltfm.h"
+#include "sdhci_f_sdh30.h"
+
+/* milbeaut bridge controller register */
+#define MLB_SOFT_RESET 0x0200
+#define MLB_SOFT_RESET_RSTX BIT(0)
+
+#define MLB_WP_CD_LED_SET 0x0210
+#define MLB_WP_CD_LED_SET_LED_INV BIT(2)
+
+#define MLB_CR_SET 0x0220
+#define MLB_CR_SET_CR_TOCLKUNIT BIT(24)
+#define MLB_CR_SET_CR_TOCLKFREQ_SFT (16)
+#define MLB_CR_SET_CR_TOCLKFREQ_MASK (0x3F << MLB_CR_SET_CR_TOCLKFREQ_SFT)
+#define MLB_CR_SET_CR_BCLKFREQ_SFT (8)
+#define MLB_CR_SET_CR_BCLKFREQ_MASK (0xFF << MLB_CR_SET_CR_BCLKFREQ_SFT)
+#define MLB_CR_SET_CR_RTUNTIMER_SFT (4)
+#define MLB_CR_SET_CR_RTUNTIMER_MASK (0xF << MLB_CR_SET_CR_RTUNTIMER_SFT)
+
+#define MLB_SD_TOCLK_I_DIV 16
+#define MLB_TOCLKFREQ_UNIT_THRES 16000000
+#define MLB_CAL_TOCLKFREQ_MHZ(rate) (rate / MLB_SD_TOCLK_I_DIV / 1000000)
+#define MLB_CAL_TOCLKFREQ_KHZ(rate) (rate / MLB_SD_TOCLK_I_DIV / 1000)
+#define MLB_TOCLKFREQ_MAX 63
+#define MLB_TOCLKFREQ_MIN 1
+
+#define MLB_SD_BCLK_I_DIV 4
+#define MLB_CAL_BCLKFREQ(rate) (rate / MLB_SD_BCLK_I_DIV / 1000000)
+#define MLB_BCLKFREQ_MAX 255
+#define MLB_BCLKFREQ_MIN 1
+
+#define MLB_CDR_SET 0x0230
+#define MLB_CDR_SET_CLK2POW16 3
+
+struct f_sdhost_priv {
+ struct clk *clk_iface;
+ struct clk *clk;
+ struct device *dev;
+ bool enable_cmd_dat_delay;
+ struct gpio_desc *power_gpio;
+};
+
+static void sdhci_milbeaut_soft_voltage_switch(struct sdhci_host *host)
+{
+ u32 ctrl = 0;
+
+ usleep_range(2500, 3000);
+ ctrl = sdhci_readl(host, F_SDH30_IO_CONTROL2);
+ ctrl |= F_SDH30_CRES_O_DN;
+ sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
+ ctrl |= F_SDH30_MSEL_O_1_8;
+ sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
+
+ ctrl &= ~F_SDH30_CRES_O_DN;
+ sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
+ usleep_range(2500, 3000);
+
+ ctrl = sdhci_readl(host, F_SDH30_TUNING_SETTING);
+ ctrl |= F_SDH30_CMD_CHK_DIS;
+ sdhci_writel(host, ctrl, F_SDH30_TUNING_SETTING);
+}
+
+static unsigned int sdhci_milbeaut_get_min_clock(struct sdhci_host *host)
+{
+ return F_SDH30_MIN_CLOCK;
+}
+
+static void sdhci_milbeaut_reset(struct sdhci_host *host, u8 mask)
+{
+ struct f_sdhost_priv *priv = sdhci_priv(host);
+ u16 clk;
+ u32 ctl;
+ ktime_t timeout;
+
+ clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+ clk = (clk & ~SDHCI_CLOCK_CARD_EN) | SDHCI_CLOCK_INT_EN;
+ sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+
+ sdhci_reset(host, mask);
+
+ clk |= SDHCI_CLOCK_CARD_EN;
+ sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+
+ timeout = ktime_add_ms(ktime_get(), 10);
+ while (1) {
+ bool timedout = ktime_after(ktime_get(), timeout);
+
+ clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+ if (clk & SDHCI_CLOCK_INT_STABLE)
+ break;
+ if (timedout) {
+ pr_err("%s: Internal clock never stabilised.\n",
+ mmc_hostname(host->mmc));
+ sdhci_dumpregs(host);
+ return;
+ }
+ udelay(10);
+ }
+
+ if (priv->enable_cmd_dat_delay) {
+ ctl = sdhci_readl(host, F_SDH30_ESD_CONTROL);
+ ctl |= F_SDH30_CMD_DAT_DELAY;
+ sdhci_writel(host, ctl, F_SDH30_ESD_CONTROL);
+ }
+}
+
+static void sdhci_milbeaut_power_off(struct sdhci_host *host)
+{
+ struct f_sdhost_priv *priv = sdhci_priv(host);
+
+ gpiod_set_value(priv->power_gpio, 0);
+ udelay(1000);
+}
+
+static void sdhci_milbeaut_power_on(struct sdhci_host *host)
+{
+ struct f_sdhost_priv *priv = sdhci_priv(host);
+
+ gpiod_set_value(priv->power_gpio, 1);
+}
+
+static void sdhci_milbeaut_set_power(struct sdhci_host *host,
+ unsigned char mode, unsigned short vdd)
+{
+ struct f_sdhost_priv *priv = sdhci_priv(host);
+
+ if (!IS_ERR(priv->power_gpio))
+ switch (mode) {
+ case MMC_POWER_UP:
+ sdhci_milbeaut_power_on(host);
+ break;
+ case MMC_POWER_OFF:
+ sdhci_milbeaut_power_off(host);
+ break;
+ }
+
+ sdhci_set_power(host, mode, vdd);
+}
+
+static const struct sdhci_ops sdhci_milbeaut_ops = {
+ .voltage_switch = sdhci_milbeaut_soft_voltage_switch,
+ .get_min_clock = sdhci_milbeaut_get_min_clock,
+ .reset = sdhci_milbeaut_reset,
+ .set_clock = sdhci_set_clock,
+ .set_bus_width = sdhci_set_bus_width,
+ .set_uhs_signaling = sdhci_set_uhs_signaling,
+ .set_power = sdhci_milbeaut_set_power,
+};
+
+static void sdhci_milbeaut_bridge_reset(struct sdhci_host *host,
+ int reset_flag)
+{
+ if (reset_flag)
+ sdhci_writel(host, 0, MLB_SOFT_RESET);
+ else
+ sdhci_writel(host, MLB_SOFT_RESET_RSTX, MLB_SOFT_RESET);
+}
+
+static void sdhci_milbeaut_bridge_init(struct sdhci_host *host,
+ int rate)
+{
+ u32 val, clk;
+
+ /* IO_SDIO_CR_SET should be set while reset */
+ val = sdhci_readl(host, MLB_CR_SET);
+ val &= ~(MLB_CR_SET_CR_TOCLKFREQ_MASK | MLB_CR_SET_CR_TOCLKUNIT |
+ MLB_CR_SET_CR_BCLKFREQ_MASK);
+ if (rate >= MLB_TOCLKFREQ_UNIT_THRES) {
+ clk = MLB_CAL_TOCLKFREQ_MHZ(rate);
+ clk = min_t(u32, MLB_TOCLKFREQ_MAX, clk);
+ val |= MLB_CR_SET_CR_TOCLKUNIT |
+ (clk << MLB_CR_SET_CR_TOCLKFREQ_SFT);
+ } else {
+ clk = MLB_CAL_TOCLKFREQ_KHZ(rate);
+ clk = min_t(u32, MLB_TOCLKFREQ_MAX, clk);
+ clk = max_t(u32, MLB_TOCLKFREQ_MIN, clk);
+ val |= clk << MLB_CR_SET_CR_TOCLKFREQ_SFT;
+ }
+
+ clk = MLB_CAL_BCLKFREQ(rate);
+ clk = min_t(u32, MLB_BCLKFREQ_MAX, clk);
+ clk = max_t(u32, MLB_BCLKFREQ_MIN, clk);
+ val |= clk << MLB_CR_SET_CR_BCLKFREQ_SFT;
+ val &= ~MLB_CR_SET_CR_RTUNTIMER_MASK;
+ sdhci_writel(host, val, MLB_CR_SET);
+
+ sdhci_writel(host, MLB_CDR_SET_CLK2POW16, MLB_CDR_SET);
+
+ sdhci_writel(host, MLB_WP_CD_LED_SET_LED_INV, MLB_WP_CD_LED_SET);
+}
+
+static void sdhci_milbeaut_vendor_init(struct sdhci_host *host)
+{
+ struct f_sdhost_priv *priv = sdhci_priv(host);
+ u32 ctl;
+
+ ctl = sdhci_readl(host, F_SDH30_IO_CONTROL2);
+ ctl |= F_SDH30_CRES_O_DN;
+ sdhci_writel(host, ctl, F_SDH30_IO_CONTROL2);
+ ctl &= ~F_SDH30_MSEL_O_1_8;
+ sdhci_writel(host, ctl, F_SDH30_IO_CONTROL2);
+ ctl &= ~F_SDH30_CRES_O_DN;
+ sdhci_writel(host, ctl, F_SDH30_IO_CONTROL2);
+
+ ctl = sdhci_readw(host, F_SDH30_AHB_CONFIG);
+ ctl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 |
+ F_SDH30_AHB_INCR_4;
+ ctl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN);
+ sdhci_writew(host, ctl, F_SDH30_AHB_CONFIG);
+
+ if (priv->enable_cmd_dat_delay) {
+ ctl = sdhci_readl(host, F_SDH30_ESD_CONTROL);
+ ctl |= F_SDH30_CMD_DAT_DELAY;
+ sdhci_writel(host, ctl, F_SDH30_ESD_CONTROL);
+ }
+}
+
+static const struct of_device_id mlb_dt_ids[] = {
+ {
+ .compatible = "socionext,milbeaut-m10v-sdhci-3.0",
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mlb_dt_ids);
+
+static void sdhci_milbeaut_init(struct sdhci_host *host)
+{
+ struct f_sdhost_priv *priv = sdhci_priv(host);
+ int rate = clk_get_rate(priv->clk);
+ u16 ctl;
+
+ sdhci_milbeaut_bridge_reset(host, 0);
+
+ ctl = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+ ctl &= ~(SDHCI_CLOCK_CARD_EN | SDHCI_CLOCK_INT_EN);
+ sdhci_writew(host, ctl, SDHCI_CLOCK_CONTROL);
+
+ sdhci_milbeaut_bridge_reset(host, 1);
+
+ if (!IS_ERR(priv->power_gpio)) {
+ sdhci_milbeaut_power_off(host);
+ msleep(20); /* need for card power off duration */
+ }
+
+ sdhci_milbeaut_bridge_init(host, rate);
+ sdhci_milbeaut_bridge_reset(host, 0);
+
+ sdhci_milbeaut_vendor_init(host);
+}
+
+static int sdhci_milbeaut_probe(struct platform_device *pdev)
+{
+ struct sdhci_host *host;
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ int irq, ret = 0;
+ struct f_sdhost_priv *priv;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(dev, "%s: no irq specified\n", __func__);
+ return irq;
+ }
+
+ host = sdhci_alloc_host(dev, sizeof(struct f_sdhost_priv));
+ if (IS_ERR(host))
+ return PTR_ERR(host);
+
+ priv = sdhci_priv(host);
+ priv->dev = dev;
+
+ host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
+ SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
+ SDHCI_QUIRK_CLOCK_BEFORE_RESET |
+ SDHCI_QUIRK_DELAY_AFTER_POWER;
+ host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE |
+ SDHCI_QUIRK2_TUNING_WORK_AROUND |
+ SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
+
+ priv->power_gpio = devm_gpiod_get_optional(dev,
+ "sni,mmc-power", GPIOD_OUT_LOW);
+
+ priv->enable_cmd_dat_delay = device_property_read_bool(dev,
+ "fujitsu,cmd-dat-delay-select");
+
+ ret = mmc_of_parse(host->mmc);
+ if (ret)
+ goto err;
+
+ platform_set_drvdata(pdev, host);
+
+ host->hw_name = "f_sdh30";
+ host->ops = &sdhci_milbeaut_ops;
+ host->irq = irq;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ host->ioaddr = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(host->ioaddr)) {
+ ret = PTR_ERR(host->ioaddr);
+ goto err;
+ }
+
+ if (dev_of_node(dev)) {
+ sdhci_get_of_property(pdev);
+
+ priv->clk_iface = devm_clk_get(&pdev->dev, "iface");
+ if (IS_ERR(priv->clk_iface)) {
+ ret = PTR_ERR(priv->clk_iface);
+ goto err;
+ }
+
+ ret = clk_prepare_enable(priv->clk_iface);
+ if (ret)
+ goto err;
+
+ priv->clk = devm_clk_get(&pdev->dev, "core");
+ if (IS_ERR(priv->clk)) {
+ ret = PTR_ERR(priv->clk);
+ goto err_clk;
+ }
+
+ ret = clk_prepare_enable(priv->clk);
+ if (ret)
+ goto err_clk;
+ }
+
+ sdhci_milbeaut_init(host);
+
+ ret = sdhci_add_host(host);
+ if (ret)
+ goto err_add_host;
+
+ return 0;
+
+err_add_host:
+ clk_disable_unprepare(priv->clk);
+err_clk:
+ clk_disable_unprepare(priv->clk_iface);
+err:
+ sdhci_free_host(host);
+ return ret;
+}
+
+static int sdhci_milbeaut_remove(struct platform_device *pdev)
+{
+ struct sdhci_host *host = platform_get_drvdata(pdev);
+ struct f_sdhost_priv *priv = sdhci_priv(host);
+
+ sdhci_remove_host(host, readl(host->ioaddr + SDHCI_INT_STATUS) ==
+ 0xffffffff);
+
+ clk_disable_unprepare(priv->clk_iface);
+ clk_disable_unprepare(priv->clk);
+
+ sdhci_free_host(host);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver sdhci_milbeaut_driver = {
+ .driver = {
+ .name = "sdhci-milbeaut",
+ .of_match_table = of_match_ptr(mlb_dt_ids),
+ },
+ .probe = sdhci_milbeaut_probe,
+ .remove = sdhci_milbeaut_remove,
+};
+
+module_platform_driver(sdhci_milbeaut_driver);
+
+MODULE_DESCRIPTION("MILBEAUT SD Card Controller driver");
+MODULE_AUTHOR("Takao Orito <orito.takao@socionext.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:sdhci-milbeaut");
diff --git a/drivers/mmc/host/sdhci_f_sdh30.c b/drivers/mmc/host/sdhci_f_sdh30.c
index 485f759..ca4c99a 100644
--- a/drivers/mmc/host/sdhci_f_sdh30.c
+++ b/drivers/mmc/host/sdhci_f_sdh30.c
@@ -19,31 +19,7 @@
#include <linux/clk.h>

#include "sdhci-pltfm.h"
-
-/* F_SDH30 extended Controller registers */
-#define F_SDH30_AHB_CONFIG 0x100
-#define F_SDH30_AHB_BIGED 0x00000040
-#define F_SDH30_BUSLOCK_DMA 0x00000020
-#define F_SDH30_BUSLOCK_EN 0x00000010
-#define F_SDH30_SIN 0x00000008
-#define F_SDH30_AHB_INCR_16 0x00000004
-#define F_SDH30_AHB_INCR_8 0x00000002
-#define F_SDH30_AHB_INCR_4 0x00000001
-
-#define F_SDH30_TUNING_SETTING 0x108
-#define F_SDH30_CMD_CHK_DIS 0x00010000
-
-#define F_SDH30_IO_CONTROL2 0x114
-#define F_SDH30_CRES_O_DN 0x00080000
-#define F_SDH30_MSEL_O_1_8 0x00040000
-
-#define F_SDH30_ESD_CONTROL 0x124
-#define F_SDH30_EMMC_RST 0x00000002
-#define F_SDH30_EMMC_HS200 0x01000000
-
-#define F_SDH30_CMD_DAT_DELAY 0x200
-
-#define F_SDH30_MIN_CLOCK 400000
+#include "sdhci_f_sdh30.h"

struct f_sdhost_priv {
struct clk *clk_iface;
diff --git a/drivers/mmc/host/sdhci_f_sdh30.h b/drivers/mmc/host/sdhci_f_sdh30.h
new file mode 100644
index 0000000..fc1ad28
--- /dev/null
+++ b/drivers/mmc/host/sdhci_f_sdh30.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2013 - 2015 Fujitsu Semiconductor, Ltd
+ * Vincent Yang <vincent.yang@tw.fujitsu.com>
+ * Copyright (C) 2015 Linaro Ltd Andy Green <andy.green@linaro.org>
+ * Copyright (C) 2019 Socionext Inc.
+ *
+ */
+
+/* F_SDH30 extended Controller registers */
+#define F_SDH30_AHB_CONFIG 0x100
+#define F_SDH30_AHB_BIGED BIT(6)
+#define F_SDH30_BUSLOCK_DMA BIT(5)
+#define F_SDH30_BUSLOCK_EN BIT(4)
+#define F_SDH30_SIN BIT(3)
+#define F_SDH30_AHB_INCR_16 BIT(2)
+#define F_SDH30_AHB_INCR_8 BIT(1)
+#define F_SDH30_AHB_INCR_4 BIT(0)
+
+#define F_SDH30_TUNING_SETTING 0x108
+#define F_SDH30_CMD_CHK_DIS BIT(16)
+
+#define F_SDH30_IO_CONTROL2 0x114
+#define F_SDH30_CRES_O_DN BIT(19)
+#define F_SDH30_MSEL_O_1_8 BIT(18)
+
+#define F_SDH30_ESD_CONTROL 0x124
+#define F_SDH30_EMMC_RST BIT(1)
+#define F_SDH30_CMD_DAT_DELAY BIT(9)
+#define F_SDH30_EMMC_HS200 BIT(24)
+
+#define F_SDH30_MIN_CLOCK 400000
--
1.9.1

\
 
 \ /
  Last update: 2019-04-26 04:05    [W:0.084 / U:0.776 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site